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$ cat a.c
#include "b.c"
...
static int foo;
$ cc -Wall -pedantic a.c
$

$ cat a.c
#include "b.c"
...
static int foo = 42;
$ cc -Wall -pedantic a.c
$

$ cat a.c
#include "b.c"
...
      |            ^~~
b.c:1:12: warning: ‘foo’ defined but not used [-Wunused-variable]
$

$ cc --version
cc (Debian 12.2.0-14) 12.2.0
...
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR
+POSE.

$